The document discusses user testing of online educational resources in classroom settings. It argues that classroom user testing provides valuable insights that conventional user testing alone cannot reveal. Testing projects with real students and teachers allows issues to emerge that may not be apparent in isolated testing, such as usability problems when content is viewed by an entire class rather than individually. While classroom testing has limitations in what can be observed, it better reflects the real use context compared to controlled one-on-one testing, and is important for ensuring online resources meet classroom needs.